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authorTakashi Iwai <tiwai@suse.de>2023-05-23 09:53:47 +0200
committerTakashi Iwai <tiwai@suse.de>2023-05-23 12:11:23 +0200
commit74661932ac5ecb12e4378f41083be6ac17804e71 (patch)
treec1ca7e5720b036a65745005107dbfaf23dad02d8 /sound/core/seq
parent46397622a3fa8372b8fda0f04b33d16923b03b1b (diff)
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ALSA: seq: Add port inactive flag
This extends the ALSA sequencer port capability bit to indicate the "inactive" flag. When this flag is set, the port is essentially invisible, and doesn't appear in the port query ioctls, while the direct access and the connection to this port are still allowed. The active/inactive state can be flipped dynamically, so that it can be visible at any time later. This feature is introduced basically for UMP; some UMP Groups in a UMP Block may be unassigned, hence those are practically invisible. On ALSA sequencer, the corresponding sequencer ports will get this new "inactive" flag to indicate the invisible state. Reviewed-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/20230523075358.9672-27-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/seq')
-rw-r--r--sound/core/seq/seq_clientmgr.c2
-rw-r--r--sound/core/seq/seq_ports.c4
2 files changed, 6 insertions, 0 deletions
diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c
index 801d5eee21eb..6508ce63f761 100644
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -2416,6 +2416,8 @@ static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
mutex_lock(&client->ports_mutex);
list_for_each_entry(p, &client->ports_list_head, list) {
+ if (p->capability & SNDRV_SEQ_PORT_CAP_INACTIVE)
+ continue;
snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
p->addr.port, p->name,
FLAG_PERM_RD(p->capability),
diff --git a/sound/core/seq/seq_ports.c b/sound/core/seq/seq_ports.c
index 500b1a5a9679..42f4172d4766 100644
--- a/sound/core/seq/seq_ports.c
+++ b/sound/core/seq/seq_ports.c
@@ -69,11 +69,15 @@ struct snd_seq_client_port *snd_seq_port_query_nearest(struct snd_seq_client *cl
{
int num;
struct snd_seq_client_port *port, *found;
+ bool check_inactive = (pinfo->capability & SNDRV_SEQ_PORT_CAP_INACTIVE);
num = pinfo->addr.port;
found = NULL;
read_lock(&client->ports_lock);
list_for_each_entry(port, &client->ports_list_head, list) {
+ if ((port->capability & SNDRV_SEQ_PORT_CAP_INACTIVE) &&
+ !check_inactive)
+ continue; /* skip inactive ports */
if (port->addr.port < num)
continue;
if (port->addr.port == num) {